Welcome to the textbook of the future.

The term hypertext refers to the ability to go from one page (or screen) to another at the click of a mouse. This manual was prepared by inserting extra information inside the same characters used to indicate greater or lesser in math. This is called HTML--hypertext markup language. (Some browsers will allow you to view the document file so that you can see what these characters look like.)

You might note that all the distinct files that make up this manual are referred to as SLIPS, an acronym for Symbolic Logic Independent Page Set. Each page has colored words or phrases that, when clicked on, take you to a different page. You can always return to where you were by clicking on the left-hand marker in your tool bar. If you want a full screen without any icons there usually is a way of doing this (sometimes it is called "presentation mode") and you can return the tool bars by using your ESC key.

The only difference between this book and the material you access on the Web through Internet is that all the pages are found in the same place--either on the disk you are provided or in a separate folder (or directory) on your hard drive. (It is a good idea to copy your SLIPS disk to your hard drive and also make a back-up copy on a separate disk.) If you look at the top on your browser, you may see a reference to localhost. That is you--and apart from the fact your computer is talking to itself rather than to another computer at this moment you really are "on the Web."

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